diff --git a/config/migrations/2024/20240327131000-delete-all-empty-literals.sparql b/config/migrations/2024/20240327131000-delete-all-empty-literals.sparql
index 48a6dfd..8ae247b 100644
--- a/config/migrations/2024/20240327131000-delete-all-empty-literals.sparql
+++ b/config/migrations/2024/20240327131000-delete-all-empty-literals.sparql
@@ -14,7 +14,7 @@ WHERE {
   graph ?g {
     ?s ?p ?o
 
-    Filter(?o = " " || ?o = "")
-
+    FILTER (isLiteral(?o))
+    FILTER regex(str(?o), "^\\s*$")
   }
 }
\ No newline at end of file